Anxiety about TTC #2

So I am 21, married almost 3 years, and my baby girl Melody is 2. Just wrapped up what will hopefully be my last AF for a while, as we are trying for another little one! I am so excited and CANNOT wait to have another kiddo around. But now that the time is here, I am psyching myself out, thinking of all the reasons I'm not ready for number two. (Think how hard it'll be having two kids? Can we really afford it? What could go wrong?) Anyone else going through something like that?